# Relationship history for MSHA mine 3300149

Current hierarchy: **CRH PLC → Shelly Materials Inc → Shelly Materials Inc York Center**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shelly Company → Shelly Materials Inc York Center; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L G Rockhold & Sons Inc → Shelly Materials Inc York Center; 1950-01-01 to 1990-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Howard E  Rockhold → Shelly Materials Inc York Center; 1950-01-01 to 1990-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Howard E  Rockhold → L G Rockhold & Sons Inc; 1950-01-01 to 1990-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Shelly Materials Inc York Center; 1990-07-10 to 2000-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Shelly Company → Shelly Materials Inc; 1990-07-10 to 2000-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Shelly Materials Inc → Shelly Materials Inc York Center; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Shelly Materials Inc York Center; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Shelly Materials Inc; 2000-03-01 to current/open; source msha-controller-operator-history